If you are traveling to Grand Junction, in western Colorado, and you have your road bike with you there is some great road cycling there.
You can check out this web page full of helpful maps of all the great road rides in the Grand Valley.

__________________"...in Las Vegas where -the electric bills are staggering -the decor hog wild -and the entertainment saccharine -what a golden age -what a time of right and reason -the consumer's king -and unhappiness is treason..."

Spent quite some time looking at these as I planned my USA trip last year and found them invaluable! In the end I only rode both sides of the Grand Mesa one day before continuing East, so didn't get to sample all the other rides...